Spectators Balcony (Spotters Corner)If you're not a professional pilot but want to discuss issues about the job, this is the best place to loiter. You won't be moved on by 'security' and there'll be plenty of experts to answer any questions.
If you mean VHF, then it depends on which entry point you are going to, we used Shannon 131.15, the Shanwick 127.9 yesterday, on Track A. HF's 6622 and 8864. HTH.